CN111076453A - Gas bearing gas supply system for compressor, operation method and refrigeration system - Google Patents
Gas bearing gas supply system for compressor, operation method and refrigeration system Download PDFInfo
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- CN111076453A CN111076453A CN201811213211.8A CN201811213211A CN111076453A CN 111076453 A CN111076453 A CN 111076453A CN 201811213211 A CN201811213211 A CN 201811213211A CN 111076453 A CN111076453 A CN 111076453A
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 93
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000003507 refrigerant Substances 0.000 claims abstract description 108
- 230000001105 regulatory effect Effects 0.000 claims description 29
- 238000004891 communication Methods 0.000 claims description 22
- 239000007788 liquid Substances 0.000 claims description 16
- 230000001276 controlling effect Effects 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims 1
- 239000010687 lubricating oil Substances 0.000 description 8
- 239000002131 composite material Substances 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 244000126211 Hericium coralloides Species 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000010729 system oil Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/04—Shafts or bearings, or assemblies thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention relates to a gas supply system of a gas bearing for a compressor, an operation method and a refrigeration system. Wherein, the air supply system of gas bearing for the compressor includes: a first compressor, the gas bearing being disposed therein; and a second compressor for pressurizing and supplying the gaseous refrigerant in the refrigeration cycle path of the first compressor to the gas bearing. In the invention, under the condition that the gas pressure in the refrigeration circulation path of the first compressor does not reach the gas pressure required by the gas bearing, the gaseous refrigerant in the refrigeration circulation path of the first compressor is pressurized by the second compressor to meet the gas pressure required by the gas bearing, so that continuous and stable-pressure gas can be provided for the gas bearing, and the continuous and stable operation of the gas bearing is favorably ensured.
Description
Technical Field
The invention relates to the field of refrigeration systems, in particular to a gas supply system for a gas bearing for a compressor, an operation method and a refrigeration system.
Background
Refrigeration centrifugal compressors are commonly used in various commercial buildings, and oil-lubricated bearings are mainly used in the refrigeration centrifugal compressors at present, and electromagnetic bearings have also started to be developed in recent years. The adoption of oil to lubricate the bearing requires an additional lubricating oil supply system, increasing the complexity of the system; in addition, lubricating oil can enter a refrigerant system in the running process of the compressor, and an oil return system of the lubricating oil is needed; in order to prevent impurities contained in the lubricating oil from entering the bearing, a lubricating oil filtering system is also needed; in addition, the lubricating oil needs to be maintained and replaced regularly, so that the lubricating oil system is complex and difficult to maintain. The centrifugal compressor adopting the electromagnetic bearing has complex bearing control and poor system shock resistance, and needs extra abnormal power-off protection measures.
In recent years, porous gas bearings have also come to be used in centrifugal compressors, and the gas bearings support a rotating shaft by gas force. Compared with a compressor using an oil-lubricated bearing, the compressor using the gas bearing does not need an oil path system and lubricating oil maintenance; compared with the compressor adopting the electromagnetic bearing, a complex control system and an abnormal power failure protection system are not needed.
Because the gas bearing needs external gas supply when working, the gas bearing can be supplied with gas by utilizing the pressure difference of the gas suction part and the gas discharge part of the compressor after the unit is started, but the unit does not have the pressure difference to supply gas for the gas bearing before the unit is started.
Disclosure of Invention
One of the objects of the present invention is to provide a gas bearing supply system for a compressor, an operation method and a refrigeration system, which at least solve the problem that there is not enough pressure difference to supply gas to the gas bearing.
Some embodiments of the present invention provide an air supply system for a gas bearing for a compressor, including: a first compressor, the gas bearing being disposed therein; and a second compressor for pressurizing and supplying the gaseous refrigerant in the refrigeration cycle path of the first compressor to the gas bearing.
Optionally, the second compressor is configured to pressurize the gaseous refrigerant in the refrigeration cycle path of the first compressor to supply the gaseous refrigerant to the gas bearing before the first compressor is started.
Optionally, the second compressor is configured to pressurize and supply the gaseous refrigerant in the refrigeration cycle path of the first compressor to the gas bearing in a start-up state and/or an unstable operating state of the first compressor.
Optionally, the gas bearing gas supply system for the compressor comprises a condenser located in the refrigeration cycle path in which the first compressor is located; the second compressor is used for pressurizing and supplying the gaseous refrigerant in the condenser to the gas bearing.
Optionally, the gas supply system for a gas bearing for a compressor comprises: a first pipeline, a first end of which is in gas communication with a refrigeration cycle path where the first compressor is located, and a second end of which is in gas communication with the gas bearing; the first pipeline is provided with a first regulating valve, and the first regulating valve is used for controlling the on-off and/or flow of the first pipeline; a first end of the second pipeline is in gas communication with a refrigeration circulation path where the first compressor is located, and a second end of the second pipeline is in gas communication with the gas bearing; the second compressor is arranged on the second pipeline.
Optionally, the gas supply system for the gas bearing for the compressor comprises a gas storage tank, and the second end of the second pipeline and/or the second end of the first pipeline are/is in gas communication with the gas bearing through the gas storage tank.
Optionally, the air reservoir is provided with a pressure sensor and/or a temperature sensor.
Optionally, the gas supply system for the gas bearing for the compressor includes a third pipeline, a first end of the third pipeline is communicated with the gas storage tank, and a second end of the third pipeline is communicated with the refrigeration circulation path where the first compressor is located, and is configured to guide the liquid refrigerant in the gas storage tank to the refrigeration circulation path where the first compressor is located; and the third pipeline is provided with a second regulating valve for controlling the on-off and/or flow of the third pipeline.
Optionally, the first end of the third conduit communicates with the air reservoir via a bottom of the air reservoir.
Optionally, the first end of the third conduit is higher than the second end of the third conduit.
Optionally, the first line is provided with a first one-way valve, and/or the second line is provided with a second one-way valve.
Optionally, the gas supply system for the gas bearing for the compressor includes a fourth pipeline, the second end of the first pipeline and the second end of the second pipeline are both communicated with the gas bearing through the fourth pipeline, a third regulating valve is arranged on the fourth pipeline, and the third regulating valve is used for controlling the on-off and/or flow of the fourth pipeline.
Optionally, the first compressor comprises a centrifugal compressor.
Optionally, the second compressor comprises a scroll compressor, a rotary compressor or a piston compressor.
Optionally, the volume flow of the first compressor is greater than the volume flow of the second compressor.
Optionally, the condenser comprises a flooded condenser.
Some embodiments of the present invention provide a method of operating a gas supply system for a gas bearing for a compressor: before the first compressor runs, and/or in a starting state and/or in an unstable working state, the gas refrigerant in a refrigeration circulation path where the first compressor provided with the gas bearing is located is pressurized by the second compressor and then is conveyed to the gas bearing.
Optionally, before the first compressor operates, the second compressor pressurizes the gaseous refrigerant in the refrigeration cycle path where the first compressor is located and then conveys the pressurized gaseous refrigerant to the gas bearing; when the pressure of the pressurized gaseous refrigerant reaches the pressure required by the gas bearing, starting the first compressor; after the first compressor operates, when the pressure of the gaseous refrigerant in the refrigeration circulation path where the first compressor is located is increased to the pressure required by the gas bearing, the second compressor is closed, and the high-pressure gaseous refrigerant in the refrigeration circulation path where the first compressor is located is used for supplying gas to the gas bearing.
Optionally, providing an air reservoir and a third conduit; the first end of the third pipeline is communicated with the gas storage tank, and the second end of the third pipeline is communicated with a refrigeration circulation path where the first compressor is located; the second end of the second pipeline is in gas communication with the gas bearing through a gas storage tank; before the first compressor operates, the liquid refrigerant of the gas storage tank is discharged into a refrigeration circulation path where the first compressor is located through a third pipeline; the gas refrigerant in the refrigeration circulation path where the first compressor is located is pressurized by the second compressor and then is conveyed to the gas storage tank through a second pipeline, and the gas refrigerant in the gas storage tank is supplied to the gas bearing; and when the pressure of the gaseous refrigerant in the air storage tank reaches the pressure required by the gas bearing, starting the first compressor.
Some embodiments of the present invention provide a refrigeration system including the gas bearing supply system for a compressor described above.
Based on the technical scheme, the invention at least has the following beneficial effects:
in some embodiments, the gas bearing supply system for the compressor comprises a first compressor and a second compressor, wherein the gas bearing is arranged in the first compressor, and the second compressor is used for pressurizing and supplying gaseous refrigerant in a refrigeration circulation path of the first compressor to the gas bearing; under the condition that the gas pressure in the refrigeration circulation path where the first compressor is located does not reach the gas pressure required by the gas bearing, the gaseous refrigerant in the refrigeration circulation path where the first compressor is located is pressurized through the second compressor, so that the gaseous refrigerant meets the gas pressure required by the gas bearing to work, continuous gas with stable pressure can be provided for the gas bearing, and the continuous and stable work of the gas bearing is favorably ensured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic diagram of a gas bearing supply system for a compressor according to some embodiments of the present invention;
fig. 2 is a schematic view of a first compressor according to some embodiments of the present invention.
The reference numbers in the drawings:
1-a first compressor; 11-a bearing; 111-axial bearing; 112-composite bearings; 12-a housing; 121-air intake; 13-a motor rotor; 14-a motor stator; 15-first stage impeller; 16-a two-stage impeller; 17-a thrust disk; 18-a first stage diffuser; 19 a first-stage volute; 110-a bearing seat;
2-a condenser;
3-a first pipeline; 31-a first regulating valve; 32-a first one-way valve;
4-a second pipeline; 41-a second compressor; 43-a second one-way valve;
5-a gas storage tank;
6-a third pipeline; 61-a second regulating valve;
7-a fourth pipeline; 71-third regulating valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be taken as limiting the scope of the present invention.
As shown in fig. 1, the gas bearing supply system for a compressor according to some embodiments includes a first compressor 1, and the gas bearing 11 is disposed in the first compressor 1. The gaseous refrigerant in the refrigeration cycle path in which the first compressor 1 is located may be supplied to the gas bearing 11 to satisfy the operating conditions of the gas bearing 11.
After the air pressure required by the gas bearing is met, the rotor of the compressor can leave the gas bearing and become a suspension state. The compressor motor is rotated. The gas bearing is supplied with gas at a pressure sufficient to provide a precondition for the normal operation of the compressor.
In some embodiments, the gas bearing supply system for the compressor includes a second compressor 41, and the second compressor 41 is used for pressurizing and supplying the gaseous refrigerant in the refrigeration cycle path of the first compressor 1 to the gas bearing 11.
Under the condition that the gas pressure in the refrigeration circulation path of the first compressor 1 does not reach the gas pressure required by the gas bearing 11, the gaseous refrigerant in the refrigeration circulation path of the first compressor 1 is pressurized by the second compressor 41 to meet the gas pressure required by the operation of the gas bearing 11, so that the problem that the gas bearing 11 is supplied with gas by insufficient pressure difference in the unit is solved.
The second compressor 41 is used for pressurizing the gaseous refrigerant in the refrigeration circulation path where the first compressor 1 is located, so that continuous and stable-pressure gas can be provided for the gas bearing 11, and the continuous and stable operation of the gas bearing 11 is ensured; and the gaseous refrigerant supplied to the gas bearing 11 is relatively pure and not easy to be doped with liquid refrigerant, which is beneficial to ensuring the working reliability of the gas bearing 11.
The gas refrigerant in the refrigeration circulation path of the first compressor 1 is pressurized and supplied to the gas bearing 11 through the second compressor 41, no liquid medium exists in the process, a throttling device, a gas-liquid separation device and the like are not needed, and the gas bearing device is simple in structure and convenient to operate.
In some embodiments, the second compressor 41 is configured to pressurize the gaseous refrigerant in the refrigeration cycle path in which the first compressor 1 is located before the first compressor 1 is started to supply the gaseous refrigerant to the gas bearing 11.
Before the first compressor 1 is started, the pressure of the gaseous refrigerant in the refrigeration circulation path where the first compressor 1 is located is low, and the working pressure required by the gas bearing 11 cannot be achieved, and the gaseous refrigerant in the refrigeration circulation path where the first compressor 1 is located is pressurized and supplied to the gas bearing 11 through the second compressor 41, so that the problem that the gas bearing 11 is supplied with gas by insufficient pressure difference in a unit before the unit is started can be solved.
In some embodiments, the second compressor 41 is configured to pressurize and supply the gaseous refrigerant in the refrigeration cycle path of the first compressor 1 to the gas bearing 11 in the state that the first compressor 1 is just started.
When the first compressor 1 is just started, the pressure of the gaseous refrigerant in the refrigeration cycle path where the first compressor 1 is located is gradually increased, but the working pressure required by the gas bearing 11 is not yet reached, and the gaseous refrigerant in the refrigeration cycle path where the first compressor 1 is located is pressurized and supplied to the gas bearing 11 through the second compressor 41, so that the problem that the gas bearing 11 is not supplied with sufficient pressure difference in the unit can be solved.
In some embodiments, the second compressor 41 is configured to pressurize and supply the gaseous refrigerant in the refrigeration cycle path of the first compressor 1 to the gas bearing 11 in the unstable operation state of the first compressor 1.
In the unstable operation state of the first compressor 1, the pressure of the gaseous refrigerant in the refrigeration cycle path in which the first compressor 1 is located may be unstable, and the required operating pressure of the gas bearing 11 may not be satisfied, and the gaseous refrigerant in the refrigeration cycle path in which the first compressor 1 is located is pressurized and supplied to the gas bearing 11 by the second compressor 41, so that a continuous and stable-pressure gas can be supplied to the gas bearing 11.
In some embodiments, the gas bearing for compressor air supply system comprises a condenser 2, the condenser 2 being located in the refrigeration cycle path in which the first compressor 1 is located; the second compressor 41 pressurizes the gaseous refrigerant in the condenser 2 and supplies the pressurized gaseous refrigerant to the gas bearing 11.
Of course, the second compressor 41 is not limited to pressurizing the gaseous refrigerant in the condenser 2 to supply the pressurized gaseous refrigerant to the gas bearing 11. The gaseous refrigerant contained in the evaporator, the throttle device, and the piping in the refrigeration cycle path in which the first compressor 1 is located can be pressurized and supplied to the gas bearing 11 by the second compressor 41.
Alternatively, the second compressor 41 may pressurize and supply the gaseous refrigerant in the pipeline between the first compressor 1 and the condenser 2 to the gas bearing 11.
Alternatively, the second compressor 41 may also pressurize and supply the gaseous refrigerant in the evaporator located in the refrigeration cycle path in which the first compressor 1 is located to the gas bearing 11.
In some embodiments, the gas bearing gas supply system for a compressor comprises a first pipe 3, a first end of the first pipe 3 being in gas communication with the refrigeration cycle path where the first compressor 1 is located, a second end of the first pipe 3 being in gas communication with the gas bearing 11; the first pipeline 3 is provided with a first regulating valve 31, and the first regulating valve 31 is used for controlling the on-off and/or flow of the first pipeline 3.
The first line 3 can directly supply the gas bearing 11 with the gaseous refrigerant in the refrigeration cycle in which the first compressor 1 is located. The first regulating valve 31 is used to control the flow rate of the first pipeline 3 so that the gas pressure in the first pipeline 3 satisfies the pressure required by the gas bearing 11.
In some embodiments, the gas bearing gas supply system for a compressor further comprises a second pipeline 4, a first end of the second pipeline 4 is in gas communication with the refrigeration cycle path where the first compressor 1 is located, and a second end of the second pipeline 4 is in gas communication with the gas bearing 11; the second compressor 41 is provided in the second pipeline 4.
In some embodiments, the first pipeline 3 is connected in parallel with the second pipeline 4, and the gas bearing 11 can be supplied through only the first pipeline 3 in the case that the pressure of the gaseous refrigerant in the refrigeration cycle where the first compressor 1 is located satisfies the gas pressure required by the gas bearing 11. In the case where the pressure of the gaseous refrigerant in the refrigeration circulation path in which the first compressor 1 is located does not satisfy the gas pressure required by the gas bearing 11, the gaseous refrigerant in the refrigeration circulation path in which the first compressor 1 is located may be pressurized and supplied to the gas bearing 11 by the second compressor 41 on the second pipe 4.
In some embodiments, the gas bearing gas supply system for the compressor further comprises a gas storage tank 5, and the second end of the second pipeline 4 is in gas communication with the gas bearing 11 through the gas storage tank 5. The second pipeline 4 leads out the gaseous refrigerant in the refrigeration cycle path where the first compressor 1 is located, and leads to the gas storage tank 5 after being pressurized by the second compressor 41, and the gaseous refrigerant in the gas storage tank 5 is supplied to the gas bearing 11, so as to be beneficial to providing stable-pressure gas for the gas bearing 11.
In some embodiments, the gas bearing gas supply system for the compressor further comprises a gas tank 5, and the second end of the first pipeline 3 is in gas communication with the gas bearing 11 through the gas tank 5. The first pipeline 3 leads out the gaseous refrigerant in the refrigeration circulation path of the first compressor 1 to the gas storage tank 5, the gaseous refrigerant in the gas storage tank 5 is supplied to the gas bearing 11, the detection of the gas pressure in the gas storage tank 5 is facilitated, and the gas pressure in the gas storage tank 5 is adjusted according to actual conditions so as to provide stable-pressure gas for the gas bearing 11.
In some embodiments, the gas reservoir 5 is provided with a pressure sensor for detecting the pressure of the gas within the gas reservoir 5. When the pressure of the gas in the gas tank 5 does not reach the pressure required by the gas bearing 11, the gas may be pressurized by the second compressor 41 so that the pressure of the gas in the gas tank 5 satisfies the pressure required by the gas bearing 11.
In some embodiments, the gas tank 5 is provided with a temperature sensor for detecting the temperature of the gas within the gas tank 5.
In some embodiments, the gas bearing supply system for the compressor further includes a third pipeline 6, a first end of the third pipeline 6 is communicated with the gas storage tank 5, and a second end of the third pipeline 6 is communicated with the refrigeration cycle path of the first compressor 1, for guiding the liquid refrigerant in the gas storage tank 5 to the refrigeration cycle path of the first compressor 1 for refrigerant recovery. The third pipeline 6 is provided with a second regulating valve 61, and the second regulating valve 61 is used for controlling the on-off and/or flow of the third pipeline 6.
The gas storage tank 5 is used for receiving the gaseous refrigerant in the refrigeration cycle path where the first compressor 1 is located, which is introduced by the first pipeline 3 and/or the second pipeline 4, the gaseous refrigerant in the gas storage tank 5 may be liquefied, and the liquid refrigerant in the gas storage tank 5 can be introduced back to the refrigeration cycle path where the first compressor 1 is located through the third pipeline 6 to recover the refrigerant.
In some embodiments, the first end of the third pipeline 6 is communicated with the air storage tank 5 via the bottom of the air storage tank 5, so as to guide the liquid refrigerant in the air storage tank 5 back to the refrigeration cycle path where the first compressor 1 is located by using gravity.
In some embodiments, the first end of the third pipeline 6 is higher than the second end of the third pipeline 6, so as to guide the liquid refrigerant in the air storage tank 5 back to the refrigeration cycle path where the first compressor 1 is located by using gravity.
In some embodiments, the first pipeline 3 is provided with a first check valve 32, which facilitates the gaseous refrigerant in the refrigeration cycle path where the first compressor 1 is located to flow to the gas bearing 11, and prevents the gaseous refrigerant at the gas bearing 11 from flowing to the refrigeration cycle path where the first compressor 1 is located.
In some embodiments, the second pipeline 4 is provided with a second check valve 42, which facilitates the gaseous refrigerant in the refrigeration cycle path where the first compressor 1 is located to flow to the gas bearing 11, and prevents the gaseous refrigerant at the gas bearing 11 from flowing to the refrigeration cycle path where the first compressor 1 is located.
In some embodiments, the gas supply system for a gas bearing for a compressor further includes a fourth pipeline 7, the second end of the first pipeline 3 and the second end of the second pipeline 4 are both in gas communication with the gas bearing 11 through the fourth pipeline 7, a third regulating valve 71 is disposed on the fourth pipeline 7, and the third regulating valve 71 is used for controlling on/off and/or flow of the fourth pipeline 7.
In case the gas pressure in the first line 3 and/or the second line 4 reaches the pressure required by the gas bearing 11, the third regulating valve 71 is opened and gas is supplied to the gas bearing 11 through the fourth line 7. The flow rate of the gas in the fourth pipe 7 is controlled by the third regulating valve 71, so that the pressure supplied to the gas bearing 11 through the fourth pipe 7 always satisfies the requirement.
In some embodiments, the first compressor 1 comprises a centrifugal compressor.
In some embodiments, the second compressor 41 includes a compressor with a smaller volume flow, such as a scroll compressor, a rotor compressor, or a piston compressor.
In some embodiments, the volume flow of the first compressor 1 is greater than the volume flow of the second compressor 41.
In some embodiments, the condenser 2 comprises a flooded condenser. The gaseous refrigerant of the first compressor 1 is led to the condenser 2, the upper layer of the condenser 2 is the gaseous refrigerant, and the lower layer of the condenser 2 is the liquid refrigerant.
Some embodiments provide an operation method of the gas bearing gas supply system for the compressor, which is implemented before the first compressor 1 is operated, and/or in a starting state of the first compressor 1, and/or in an unstable operating state of the first compressor 1, the gas refrigerant in the refrigeration cycle path of the first compressor 1 provided with the gas bearing 11 is pressurized by the second compressor 41 and then is delivered to the gas bearing 11.
In some embodiments, before the first compressor 1 is operated, the gaseous refrigerant in the refrigeration cycle where the first compressor 1 is located is pressurized by the second compressor 41 and then is delivered to the gas bearing 11; when the pressure of the pressurized gaseous refrigerant reaches the pressure required by the gas bearing 11, the first compressor 1 is started.
After the first compressor 1 is operated, when the pressure of the gaseous refrigerant in the refrigeration cycle path of the first compressor 1 is increased to the pressure required by the gas bearing 11, the second compressor 41 is turned off, and the gas bearing 11 is supplied with gas by using the high-pressure gaseous refrigerant in the refrigeration cycle path of the first compressor 1.
In some embodiments, an air storage tank 5 and a third pipeline 6 are arranged in the air supply system of the gas bearing for the compressor; a first end of the third pipeline 6 is communicated with the gas storage tank 5, and a second end of the third pipeline 6 is communicated with a refrigeration circulation path where the first compressor 1 is located; the second end of the second conduit 4 is in gas communication with the gas bearing 11 via a gas reservoir 5.
Before the first compressor 1 is operated, the liquid refrigerant in the gas tank 5 is discharged to the refrigeration cycle path where the first compressor 1 is located through the third pipeline 6.
The gaseous refrigerant in the refrigeration cycle path in which the first compressor 1 is located is pressurized by the second compressor 41 and then sent to the gas holder 5 through the second pipe 4, and the gaseous refrigerant in the gas holder 5 is supplied to the gas bearing 11.
When the pressure of the gaseous refrigerant in the gas storage tank 5 reaches the pressure required by the gas bearing 11, the first compressor 1 is started.
The following is a method of operation of one embodiment of a gas bearing supply system for a compressor:
in this embodiment, the exhaust end of the first compressor 11 is communicated with the condenser 2, the upper layer of the condenser 2 is a gaseous refrigerant, and the lower layer of the condenser 2 is a liquid refrigerant.
The upper layer of the condenser 2 is communicated with an air storage tank 5 through a first pipeline 3. The first line 3 is provided with a first regulating valve 31.
The upper layer of the condenser 2 is also communicated with an air storage tank 5 through a second pipeline 4 which is connected with the first pipeline 3 in parallel. The second conduit 4 is provided with a second compressor 41.
The bottom of the gas storage tank 5 is communicated with the lower layer of the condenser 2 through a third pipeline 6. The third line 6 is provided with a second regulating valve 61.
The top of the gas storage tank 5 is in gas communication with the gas bearing 11 through a fourth pipeline 7. The fourth line 7 is provided with a third regulating valve 71.
Before the first compressor 1 operates, the pressure of the gaseous refrigerant at the top of the condenser 2 is the same as that of the gaseous refrigerant in the gas storage tank 5, the second regulating valve 61 is opened, and the liquid refrigerant in the gas storage tank 5 is discharged into the condenser 2 by utilizing the action of gravity; after a period of time, the second compressor 41 is turned on, the second compressor 41 compresses the gaseous refrigerant at the top of the condenser 2 into the gas storage tank 5, the pressure of the gas storage tank 5 rises, and after a period of time, the liquid refrigerant in the gas storage tank 5 is emptied, and then the second regulating valve 61 is closed.
When the pressure of the gas storage tank 5 rises to the pressure required by the gas bearing 11, the third regulating valve 71 is opened to ensure that the gas supply of the gas bearing 11 meets the requirement.
When the first compressor 1 is started, the second compressor 41 continuously compresses the gaseous refrigerant in the condenser 2 to the gas tank 5, and the gas tank 5 supplies gas to the gas bearing 11.
After the first compressor 1 is stably operated, the pressure in the condenser 2 is gradually increased, and when the pressure in the condenser 2 is increased to a pressure capable of satisfying the gas pressure required by the gas bearing 11, the first regulating valve 31 is opened and the second compressor 41 is closed.
At this time, the gas bearing 11 supplies gas and works by using the high-pressure gaseous refrigerant in the condenser 2, and the pressure in the gas storage tank 5 is controlled within a reasonable interval by adjusting the first adjusting valve 31, so that the stability of gas supply of the gas bearing 11 is ensured.
Some embodiments provide a refrigeration system including the gas bearing gas supply system for a compressor described above.
The refrigeration system includes a first compressor 1 in an air supply system for a gas bearing for a compressor, and a refrigeration circulation path in which the first compressor 1 is located.
The refrigeration cycle path in which the first compressor 1 is located includes the first compressor 1, and also includes a condenser 2, and an evaporator and a throttling device, etc.
The cycle process of the refrigeration cycle path in which the first compressor 1 is located is as follows: first compressor 1-condenser 2-throttling device-evaporator-first compressor 1.
As shown in fig. 2, a specific embodiment of the first compressor 1 is listed below:
the first compressor 1 includes a gas bearing 11, a casing 12, a motor rotor 13, a motor stator 14, a first-stage impeller 15, a second-stage impeller 16, a thrust disk 17, a first-stage diffuser 18, a first-stage volute 19, and the like.
The motor rotor 13 and the motor stator 14 are provided in the casing 12. The inner diameter of the casing 12 matched with the motor stator 14 is provided with a spiral groove structure. When the first compressor 1 works, throttled refrigerants are introduced into the spiral groove, and when the refrigerants flow in the spiral groove, heat on the surface of the motor can be taken away through evaporation, so that cooling of the motor is achieved, and the working temperature of the motor is reduced.
The primary impeller 15 and the secondary impeller 16 are disposed at both ends of the motor rotor 13 in a back-to-back direction. With this structural arrangement, the axial force of the motor rotor 13 can be reduced.
The thrust disk 17 is disposed downstream of the primary impeller 15 in the airflow direction.
The gas bearing 11 includes an axial bearing 111 and a composite bearing 112. Axial bearings 111 and compound bearings 112 are disposed on both sides of the thrust disk 17.
The axial bearing 111 is axially positioned by a positioning ring, so that a gap between the axial bearing 111 and the thrust disk 17 is ensured.
The composite bearing 112 is a composite bearing of both axial and radial directions, and the composite bearing 112 can bear both axial and radial loads.
The first-stage diffuser 18 serves as a diffuser flow channel, and the inner ring of the first-stage diffuser contains a comb tooth structure serving as a sealing element and used for preventing high-pressure gaseous refrigerant flowing out of the first-stage impeller 15 from leaking into a motor cavity.
The first-stage volute 19 includes a volute structure for collecting the gaseous refrigerant compressed by the first-stage impeller 14 and flowing to the inlet of the second-stage impeller 16.
The casing 12, the first-stage diffuser 18 and the bearing seat 110 are respectively provided with air holes for providing gaseous refrigerant to the gas bearing 11, the air inlet hole 121 communicated with the air supply system is arranged in the casing 12, and the gaseous refrigerant provided by the air supply system flows into the gas bearing 11 through the air holes arranged in the air inlet hole 121, the casing 12, the first-stage diffuser 18 and the bearing seat 110 to form an air film and support the motor rotor 13, so that the bearing working process is completed.
The gas supply to the gas bearing 11 is required before the first compressor 1 starts to operate, and the gas supply can be stopped after the first compressor 1 completely stops rotating.
In the description of the present invention, it should be understood that the terms "first", "second", "third", etc. are used to define the components, and are used only for the convenience of distinguishing the components, and if not otherwise stated, the terms have no special meaning, and thus, should not be construed as limiting the scope of the present invention.
Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (20)
1. An air supply system for a gas bearing for a compressor, comprising:
a first compressor (1) in which the gas bearing (11) is disposed; and
and a second compressor (41) for pressurizing and supplying the gaseous refrigerant in the refrigeration cycle path in which the first compressor (1) is located to the gas bearing (11).
2. The gas bearing supply system for a compressor according to claim 1, wherein the second compressor (41) is configured to pressurize and supply the gaseous refrigerant in a refrigeration cycle in which the first compressor (1) is located to the gas bearing (11) before the first compressor (1) is started.
3. The gas bearing supply system for a compressor according to claim 1, wherein the second compressor (41) is configured to supply the gas bearing (11) with the pressurized gaseous refrigerant in the refrigeration cycle in which the first compressor (1) is located, in a state immediately after the first compressor (1) is started and/or in an unstable operating state.
4. Gas bearing gas supply system for a compressor according to claim 1, characterized by comprising a condenser (2) located in a refrigeration circulation path in which the first compressor (1) is located; the second compressor (41) is used for pressurizing and supplying the gaseous refrigerant in the condenser (2) to the gas bearing (11).
5. The gas bearing supply system for a compressor as claimed in claim 1, comprising:
a first pipe (3) having a first end in gaseous communication with a refrigeration cycle path in which the first compressor (1) is located and a second end in gaseous communication with the gas bearing (11); a first regulating valve (31) is arranged on the first pipeline (3), and the first regulating valve (31) is used for controlling the on-off and/or flow of the first pipeline (3); and
a second conduit (4) having a first end in gaseous communication with a refrigeration cycle path in which the first compressor (1) is located and a second end in gaseous communication with the gas bearing (11); the second compressor (41) is arranged on the second pipeline (4).
6. The gas supply system for a gas bearing for a compressor according to claim 5, comprising a gas tank (5), wherein the second end of the second pipe (4) and/or the second end of the first pipe (3) is in gas communication with the gas bearing (11) through the gas tank (5).
7. The gas bearing supply system for a compressor as claimed in claim 6, wherein said gas storage tank (5) is provided with a pressure sensor and/or a temperature sensor.
8. The gas bearing supply system for the compressor as claimed in claim 6, comprising a third pipeline (6), wherein a first end of the third pipeline (6) is communicated with the gas storage tank (5), and a second end of the third pipeline (6) is communicated with a refrigeration cycle path of the first compressor (1) for guiding the liquid refrigerant in the gas storage tank (5) to the refrigeration cycle path of the first compressor (1); the third pipeline (6) is provided with a second regulating valve (61) for controlling the on-off and/or flow of the third pipeline (6).
9. The gas bearing supply system for a compressor as claimed in claim 8, wherein the first end of the third line (6) communicates with the gas storage tank (5) via a bottom of the gas storage tank (5).
10. Gas bearing supply system for a compressor according to claim 8, characterized in that the first end of the third line (6) is higher than the second end of the third line (6).
11. Gas supply system for a gas bearing for a compressor according to claim 5, characterized in that said first line (3) is provided with a first non-return valve (32) and/or said second line (4) is provided with a second non-return valve (42).
12. The gas supply system for the gas bearing for the compressor as claimed in claim 5, comprising a fourth pipeline (7), wherein the second end of the first pipeline (3) and the second end of the second pipeline (4) are both in gas communication with the gas bearing (11) through the fourth pipeline (7), and a third regulating valve (71) is arranged on the fourth pipeline (7), and the third regulating valve (71) is used for controlling the on-off and/or the flow of the fourth pipeline (7).
13. Gas bearing supply system for a compressor according to claim 1, characterized in that the first compressor (1) comprises a centrifugal compressor.
14. Gas bearing supply system for a compressor, according to claim 1, characterised in that said second compressor (41) comprises a scroll compressor, a rotor compressor or a piston compressor.
15. Gas bearing supply system for a compressor, according to claim 1, characterized in that the volumetric flow rate of said first compressor (1) is greater than the volumetric flow rate of said second compressor (41).
16. The gas bearing supply system for a compressor according to claim 4, wherein the condenser (2) comprises a flooded condenser.
17. An operation method of a gas bearing gas supply system for a compressor according to claim 1, characterized in that before the first compressor (1) is operated, and/or immediately after the first compressor (1) is started, and/or in an unstable operation state of the first compressor (1), the gaseous refrigerant in a refrigeration cycle path in which the first compressor (1) provided with the gas bearing (11) is located is pressurized by the second compressor (41) and then delivered to the gas bearing (11).
18. The method for operating a gas supply system for a gas bearing for a compressor according to claim 17,
before the first compressor (1) operates, the second compressor (41) is used for pressurizing the gaseous refrigerant in the refrigeration circulation path where the first compressor (1) is located and then conveying the pressurized gaseous refrigerant to the gas bearing (11); when the pressure of the pressurized gaseous refrigerant reaches the pressure required by the gas bearing (11), the first compressor (1) is started;
after the first compressor (1) is operated, when the pressure of the gaseous refrigerant in the refrigeration circulation path of the first compressor (1) is increased to the pressure required by the gas bearing (11), the second compressor (41) is closed, and the gas bearing (11) is supplied with gas by using the high-pressure gaseous refrigerant in the refrigeration circulation path of the first compressor (1).
19. The operation method of the gas bearing supply system for a compressor as claimed in claim 18, wherein an air storage tank (5) and a third piping (6) are provided; the first end of the third pipeline (6) is communicated with the air storage tank (5), and the second end of the third pipeline (6) is communicated with a refrigeration circulation path where the first compressor (1) is located; the second end of the second pipeline (4) is in gas communication with the gas bearing (11) through a gas storage tank (5);
before the first compressor (1) operates, discharging the liquid refrigerant of the air storage tank (5) into a refrigeration circulation path where the first compressor (1) is located through a third pipeline (6);
the gas refrigerant in the refrigeration circulation path where the first compressor (1) is located is pressurized by the second compressor (41) and then is conveyed to the gas storage tank (5) through the second pipeline (4), and the gas refrigerant in the gas storage tank (5) is supplied to the gas bearing (11);
when the pressure of the gaseous refrigerant in the air storage tank (5) reaches the pressure required by the gas bearing (11), the first compressor (1) is started.
20. A refrigerating system comprising the gas supply system for a gas bearing for a compressor according to any one of claims 1 to 16.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811213211.8A CN111076453B (en) | 2018-10-18 | 2018-10-18 | Air supply system of air bearing for compressor, operation method and refrigeration system |
| PCT/CN2018/121191 WO2020077788A1 (en) | 2018-10-18 | 2018-12-14 | Gas supply system of gas bearing for compressor, operation method and refrigeration system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811213211.8A CN111076453B (en) | 2018-10-18 | 2018-10-18 | Air supply system of air bearing for compressor, operation method and refrigeration system |
Publications (2)
| Publication Number | Publication Date |
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| CN111076453A true CN111076453A (en) | 2020-04-28 |
| CN111076453B CN111076453B (en) | 2024-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811213211.8A Active CN111076453B (en) | 2018-10-18 | 2018-10-18 | Air supply system of air bearing for compressor, operation method and refrigeration system |
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| CN (1) | CN111076453B (en) |
| WO (1) | WO2020077788A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022048175A1 (en) * | 2020-09-02 | 2022-03-10 | 珠海格力电器股份有限公司 | Gas supply system of gas bearing for compressor, operation method and refrigeration system |
| CN114198924A (en) * | 2021-11-22 | 2022-03-18 | 青岛海尔空调电子有限公司 | Air supply system and refrigerant circulating system for air suspension compressor |
| CN114198926A (en) * | 2021-11-22 | 2022-03-18 | 青岛海尔空调电子有限公司 | Air supply system of compressor and control method for the same |
| CN114198925A (en) * | 2021-11-22 | 2022-03-18 | 青岛海尔空调电子有限公司 | Gas-liquid supply system of compressor |
| CN114198920A (en) * | 2021-11-22 | 2022-03-18 | 青岛海尔空调电子有限公司 | Method and device for controlling refrigerant circulation system and refrigerant circulation system |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3931718A (en) * | 1970-04-16 | 1976-01-13 | Hall-Thermotank Products Ltd. | Refrigerant screw compression with liquid refrigerant injection |
| CN1181490A (en) * | 1996-10-25 | 1998-05-13 | 三菱重工业株式会社 | Compressor for use in refrigerator |
| JP2004044954A (en) * | 2002-07-12 | 2004-02-12 | Mitsubishi Heavy Ind Ltd | Turbo refrigerating machine comprising compressor with gas bearing and its operating method |
| US20100247308A1 (en) * | 2007-11-14 | 2010-09-30 | Bsh Bosch Und Siemens Hausgerate Gmbh | Aerostatic bearing and method for production thereof |
| US20180023584A1 (en) * | 2016-07-25 | 2018-01-25 | Daikin Applied Americas Inc. | Centrifugal compressor and magnetic bearing backup system for centrifugal compressor |
| CN108291575A (en) * | 2015-10-08 | 2018-07-17 | 伯明翰高性能涡轮机械公司 | Gas bearing or improvement about gas bearing |
| CN208871909U (en) * | 2018-10-18 | 2019-05-17 | 珠海格力电器股份有限公司 | The air supply system and refrigeration system of compressor gas bearing |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NO342066B1 (en) * | 2016-06-03 | 2018-03-19 | Vetco Gray Scandinavia As | Modular stackable compressor with gas bearings and system for raising the pressure in production gas |
| EP3508733B1 (en) * | 2016-12-09 | 2020-08-12 | Mitsubishi Heavy Industries Compressor Corporation | Compressor system provided with a gas bearing, and method for supplying gas to a compressor provided with a gas bearing |
-
2018
- 2018-10-18 CN CN201811213211.8A patent/CN111076453B/en active Active
- 2018-12-14 WO PCT/CN2018/121191 patent/WO2020077788A1/en active Application Filing
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3931718A (en) * | 1970-04-16 | 1976-01-13 | Hall-Thermotank Products Ltd. | Refrigerant screw compression with liquid refrigerant injection |
| CN1181490A (en) * | 1996-10-25 | 1998-05-13 | 三菱重工业株式会社 | Compressor for use in refrigerator |
| JP2004044954A (en) * | 2002-07-12 | 2004-02-12 | Mitsubishi Heavy Ind Ltd | Turbo refrigerating machine comprising compressor with gas bearing and its operating method |
| US20100247308A1 (en) * | 2007-11-14 | 2010-09-30 | Bsh Bosch Und Siemens Hausgerate Gmbh | Aerostatic bearing and method for production thereof |
| CN108291575A (en) * | 2015-10-08 | 2018-07-17 | 伯明翰高性能涡轮机械公司 | Gas bearing or improvement about gas bearing |
| US20180023584A1 (en) * | 2016-07-25 | 2018-01-25 | Daikin Applied Americas Inc. | Centrifugal compressor and magnetic bearing backup system for centrifugal compressor |
| CN208871909U (en) * | 2018-10-18 | 2019-05-17 | 珠海格力电器股份有限公司 | The air supply system and refrigeration system of compressor gas bearing |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022048175A1 (en) * | 2020-09-02 | 2022-03-10 | 珠海格力电器股份有限公司 | Gas supply system of gas bearing for compressor, operation method and refrigeration system |
| CN114198924A (en) * | 2021-11-22 | 2022-03-18 | 青岛海尔空调电子有限公司 | Air supply system and refrigerant circulating system for air suspension compressor |
| CN114198926A (en) * | 2021-11-22 | 2022-03-18 | 青岛海尔空调电子有限公司 | Air supply system of compressor and control method for the same |
| CN114198925A (en) * | 2021-11-22 | 2022-03-18 | 青岛海尔空调电子有限公司 | Gas-liquid supply system of compressor |
| CN114198920A (en) * | 2021-11-22 | 2022-03-18 | 青岛海尔空调电子有限公司 | Method and device for controlling refrigerant circulation system and refrigerant circulation system |
| CN114198926B (en) * | 2021-11-22 | 2023-09-26 | 青岛海尔空调电子有限公司 | Air supply system of compressor and control method for the same |
| CN114198920B (en) * | 2021-11-22 | 2023-11-24 | 青岛海尔空调电子有限公司 | Method and device for controlling refrigerant circulation system and refrigerant circulation system |
| CN114198925B (en) * | 2021-11-22 | 2024-02-23 | 青岛海尔空调电子有限公司 | Gas-liquid supply system of compressor |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020077788A1 (en) | 2020-04-23 |
| CN111076453B (en) | 2024-05-07 |
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